arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.5089math.STstat.TH
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PCA-核估计

PCA-Kernel Estimation

Gérard Biau, André Mas

摘要:

用于高维或功能数据的许多统计估计技术基于初步降维步骤,其包括将样本$\bX_1, \hdots, \bX_n$投影到与经验投影器$\hat Π_D$相关联的主成分分析(PCA)的第一$D$特征向量上。经典的非参数推理方法,如核密度估计或核回归分析,然后在(通常是小)$D$维空间。然而,由于投影样本$(\hat Π_D\bX_1,\hdots, \hat Π_D\bX_n)$的随机变量不再是独立的这一事实,这种数据驱动的降维方案的数学分析引起了技术问题。作为进一步研究的参考,我们在本文中提供了几个结果,显示了重要的核相关的量之间的渐近等价性的基础上的经验投影仪和它的理论对应。作为一个例子,我们提供了一个深入的分析非参数核回归的情况下,

英文摘要:

Many statistical estimation techniques for high-dimensional or functional data are based on a preliminary dimension reduction step, which consists in projecting the sample $\bX_1, \hdots, \bX_n$ onto the first $D$ eigenvectors of the Principal Component Analysis (PCA) associated with the empirical projector $\hat Π_D$. Classical nonparametric inference methods such as kernel density estimation or kernel regression analysis are then performed in the (usually small) $D$-dimensional space. However, the mathematical analysis of this data-driven dimension reduction scheme raises technical problems, due to the fact that the random variables of the projected sample $(\hat Π_D\bX_1,\hdots, \hat Π_D\bX_n)$ are no more independent. As a reference for further studies, we offer in this paper several results showing the asymptotic equivalencies between important kernel-related quantities based on the empirical projector and its theoretical counterpart. As an illustration, we provide an in-depth analysis of the nonparametric kernel regression case

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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